Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh lai » hanh lam, hanh tai, thanh lap
cua viet » ca viet, hoa viet, cua vat
tang ma » mang may, tang van
tuc van » thuc van, truc van, tuc va
lai cua » dai cua, hai cua, lai chau
sanh y » sinh y, anh y, hanh y
y tang » ky tang, 6 tang, 7 tang
ma hoi » mai hoi, xa hoi, ma hoa
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: do sanh y tang ma hoi. hieu ((ve cam) or (ve cac)) tuc van hanh lai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: do sanh y tang ma hoi. hieu ((ve cam) OR (ve cac)) tuc van hanh lai cua viet*.